What is the most common growing media?

Today, peat remains the main constituent for many growing media mixes as no other material combines as many favourable characteristics as this material. It is favoured due to its high water-holding ability and good aeration.

growing-media.eu - growingmedia - Growing Media Europe

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A short introduction Often also referred to as “substrate” or “potting soil”, a growing medium is a material, other than soil on the spot, in which plants are grown. As an important supplier to the modern horticultural industry, the peat and growing media sector is an important contributor to its sustainability. It represents an industry with a €1.3 billion turnover accounting for 11,000 jobs across Europe and is essential to the horticulture industry which is estimated to have a turnover of approx. €60 billion and provides for over 750,000 jobs. Growing media are used by the horticulture industry as well as consumers to support the development of plants. The growing medium ensures that the plant can healthily grow by providing it with a range of essential elements: an optimum rooting environment for physical stability

storage of air for the roots

water absorption and retention --> availability to the plant when needed

supply of nutrients for the roots Growing media are used to grow a wide variety of plants including vegetables, fruits, floriculture ornamentals, tree and shrub ornamentals and speciality plants. The range of growing media constituents used includes peat, coir pith, woodfibers, bark, composted materials i.e. green waste, and bark. Mineral constituents like perlite, pumice, clay and vermiculite are also used. Growing media are often formulated from a blend of such raw materials, usually enriched with fertilizers, lime and sometimes biological additives in order to achieve the correct balance of physical, chemical and biological properties for the plants to be grown. Having the right growing media mix is as important for an optimal plant growth as water and fertilisers. Plant species differ considerably in their need for water and nutrients, and therefore need different kinds of growing media to provide the best growing conditions. Due to this, a wide range of different kinds of growing media are available on the market. The horticulture industry uses thousands of different growing media mixes. In this context, the growing media industry chooses different materials based on their performance, the plants’ needs, availability and sustainable development considerations. For example: for young trees and shrubs a substrate with wood fibres or bark is often used as it provides more physical stability clay is frequently used for plants with high water needs as it can store the water longer

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perlite is a material used to enhance the drainage of water In sum, the right growing medium provides growing conditions that are predictable and reliable for the grower, contributing to higher yields and more efficient growing.

About Growing Media

Growing Media constituents The products supplied by Growing Media Europe members contain the complete range of available growing media constituents. Some of the most important ones include: BARK: The tough protective outer sheath of the trunk, branches, and twigs of a tree or woody shrub. Bark is used as the sole constituent in orchid cultivation or as a constituent in potting mixes for tree nurseries and floriculture. Only certain barks are suited as growing media constituents. Bark is also used as a mulching material. CLAY: This material is often added in the form of dried granules or as a powder. Clay has a high ability to bind water as well some nutrients. It therefore influences the water characteristics of the growing medium. It can also partly act as a nutrient buffer, making it possible to add more fertilizer without reaching to high salinity levels. COIR PITH: Coir is obtained by mechanical processing of the husk of coconuts. It is primarily imported from the Far East (Sri-Lanka, India, Philippines). This material has good wettability characteristics and is often mixed with other constituents in mixes for sowing, propagating and potting. Sometimes also used as the sole constituent of grow bag mixes in vegetable and flower cultures. GREEN COMPOST: A material produced from organic waste materials such as tree branches, leaves, grass clippings and plant residues. These residual materials are decomposed by microorganisms under controlled conditions. Plants do not grow in 100 % compost, and the material must be diluted with e.g. peat. Good quality composts for the growing media industry are becoming rare in some EU member states due to the increasing use of woody input material for energy production instead of composting. BLACK PEAT: Peat is formed when plants such as peatmosses are submerged in water and only partly decomposed due to a lack of oxygen. In some areas peat accumulated over the years in small lakes, growing from the bottom to the top. The lower layers of peat are called “black peat”. They are the oldest and most decomposed, characterised by hardly to non-recognizable plant structures and a dark brown to almost black colour. This peat is used in all horticultural segments and is the second most important constituent of growing media throughout Europe. WHITE PEAT: This peat is weakly to moderately decomposed and taken from the upper and younger layers of a peatland. It has visible plant structure and a yellowish brown to dark brown colour. White peat is used in all horticultural segments and is the main constituent of growing media throughout Europe. PERLITE: A material that is manufactured from naturally occurring hydrated volcanic rock (perlite), expanded by heat to form a cellular structure. Usually mixed into growing media in order to improve the flow-ability of a growing media mix, increase the air content and improve the water uptake. RICE HULLS: Are the hard protecting coverings of grains of rice and are obtained in the rice manufacturing industry. Rice hulls can be added to mixes to improve air capacity. It is a constituent of lower importance. SAND and GRIT: Are used in growing media to improve the flowability of the mix as well as to add weight where needed. These materials can also improve the water movement in the growing medium to some extent. WOOD FIBRES: Fibres that have been obtained by mechanically or mechanically-thermally fraying of un-treated wood and/or wood wastes. Wood fibres are used in mixes for pot plants, trees, shrubs, etc. and used in combination with peat and other constituents. Stonewool: Is made from naturally abundant basalt. It can be adjusted to growers needs and is mainly used in high tech greenhouses. It enables efficient use of resources such as water and nutrients, and is 100% recyclable.

growing-media.eu - growingmedia - Growing Media Europe

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